It could be possible that your font cache was corrupted accidentally during the update. I would recommend either a) (easy) trash your preferences or b) manually delete both of your font caches using the steps found here: https://helpx.adobe.com/photoshop/kb/troubleshoot-fonts-photoshop.html. If I'm right, that should solve your issue. Either way, let us know so we can either figure out the next step or confirm what the problem was.